1.polyester needle felt 2.good alkali resistance 3.stable physical dimension 4.good ... ): 150-350Surface treatment: singeing, calendaring, heat settingBrief Introduction:polyester needle felt adopt nonwoven workmanship, with the property of stable physical dimension ... mixed with acid and alkali,water and oil.Needle-punched felt are widely used in metallurgy,chemical industry ,building materials,smelting ...